Toolholder



8- J. F. GOLDEN ETAL 2,435,212

TOOLHOLDER Filed May 3, 1945 2 Sheets-Sheet 1 FIG. I.

INVENTORS JOHN F. GOLDEN HAROLD J. SMITH WLW ATTORNEY Patented Feb. 3, 1948 UNITED STATES ATNT OFFICE 'rooLHonnEa v John F. Golden, Lynn, and Harold J. Smith,

Everett, Mass.

(Granted under the act of March a, 1883, as amended April 30, 1928; 370 0. G. 757) Our invention relates to a toolholder. It has to do, more particularly, with a toolholding attachment for use on machine tools and which is especially suitable for turning out curved surfaces on the work.

At present, attachments are provided on machine tools such as lathes for turning out work with curved surfaces, for example, spherical surfaces. However, with present. devices it is difiicult to change the position of the tool post each time it is desired to change the radius of the surface to be produced. It is necessary to use a wrench or other tool to release the clamp on the tool post, slide the post along a guide to its new position, and then use the Wrench to again clamp the tool post in position. It is also difiicult to locate the tool post accurately.

One of the objects of our invention is to provide a toolholder which is of such a, nature that it may be easily and quickly actuated to position the toolholder properly to turn out curved surfaces of a pro-selected radius.

Another object of our invention is to provide a toolholder which is of simple structure but which can be actuated to accurately position the tool as desired.

The preferred embodiment of our invention is illustrated in the accompanying drawings wherein similar characters of reference designate cor-- responding parts and wherein:

Fig. 1 is a side elevational view of a lathe with our tooiholder positioned thereon.

Fig. 2 is a perspective view of our toolholder.

Fig. 3 is a top plan view, partly broken away, of our toolholder.

Fig. 4 is a view of our toolholder, partly, in side elevation, but mainly in vertical section along line l4 of Fig. 3.

With reference to the drawings, in Fig. 1 we have illustrated a lathe l to which our toolholder 2 is shown attached. The toolholder is carried block which has a guideway l2 (Figs. 3 and 4) formed in its lower surface and extending longi-, tudinally thereof. This guideway I2 is in the form of a T-slot and has a T-shape guide [3 disposed therein. The guide I3 is formed On the upper end of a vertically-disposed pivot pin M which is rotatably disposed in a vertical openin I5 formed substantially at the center of plate 5.

The guideway l2 has a screw l6 extending longitudinally thereof. This screw is threaded through the guide 13 and its outer end is rotatably disposed in a bearing member I! at the outer end of the guideway. The screw 16 is provided with a square outer end l8 for receiving a crank by which it may be rotated. Rotating screw IE will move thearm I l radially on plate 5 relative to pin [4.

The arm ll carries adjacent to its outer end a tool post [9. This tool post has a flanged lower end 20 disposed within the arm II. A sleeve 2! surrounds the post and rests on the upper surface of arm H. The post l9 has a vertical slot 22 formed therein and extending below the upper edge of sleeve 2|. This slot receives a cutting tool 23 which is clamped therein by a screw 2 threaded through the top of the post.

The pin l4 extends through plate 5 and has a horizontally disposed worm gear 25 keyed on its lower end. The gear 25 is held in its horizontal position by a nut 2t threaded on the lower end of pin Ill and engaging the lower surface of the on the carriage 3 of the lathe by being attached directly to the compound rest 4 thereof.

Our toolholder comprises a supporting plate 5, as shown in Figs. 2, 3, and 4, which has an integral support 5 at its rear edge. The support 5 extends upwardly and includes a rearwardly extending horizontally disposed arm I. This arm I is of square cross-section. The arm I is clamped to the compound :3. This is accomplished with a clamp 8 (Fig. 1) which has a T-bolt 9 fitting into the undercut slot in compound 4 and a bar it which engages the top of arm I.

The plate 5 carries on its upper surface a swinging arm II. This arm H is in the form of a gear 25. A worm 21 meshes with the gear 25. This worm 27 is carried by a horizontally disposed shaft '28 which extends transversely of plate 5 and, is rotatably carried in bearings 29 and 30 carried by the plate 5. The lower surface of plate 5 is recessed'to receive the bearings 29 and 30 and the worm 21, as shown in Figs. 3 and 4. A housing 3| is secured below the plate 5 for enclosing the worm and gear mechanism. The shaft 28 extends from the housing 3| and its outer end has a handwheel 32 keyed thereon by means of which it may be rotated.

In using our attachmenhthe work is placed in a chuck 33 mounted on the spindleof the lathe. The work, in the example shown, is in the form of a cylinder 3d of metal which is to have a spherical socket formed therein. The cutting tool 23 is so positioned that a surface of predetermined radius will be cut on the work. This adjustment is easily and quickly made by operating thescrew It to move the tool post relative to the pin Id, about which the arm l I will swing. To cut the spherical surface on the work, the carriage 3 is adjusted until the tool contacts with the work 3d. The handwheel 32 is then operated to cause the cutting tool 23 to swing across the face of the work. Since the arm H swings about pivot pin l4 and since the work 34 is rotating, the desired concave spherical surface will be produced on the work. The radius of curvature of the surface produced may be changed readily and accurately by operation of-tli s'crewiii to move arm H radially.

Our attachment is particularly suitable for use on lathes and boring mills but is capable cran plication to other machine tools such as shapeis and planers, for example, for cutting curved surfaces. The invention described herein may be manuthe United States of America for governmental purposes without the payment of any rbyalty thereon or therefor. a

Having thus described our invention, what w claim is:

A tool holding attachment of the type described comprising; a supporting plate, asupport at'the rear edge of andintegral with said supporting plate; said support extending? upwardly from said supporting plate and includinga rearwardly extending horizontal arm, sa'i'd arm providing means by which said attachment may be supported, a swinging block adapted to be carried on the upper surface of said supportin plate, said swinging block having a T-shape guid'eway formed in its lower surface and extending longi tudinally thereof, a vertically disposed pivot pin, said pivot" pin adapted to be; rotatably mounted through and substantially at the center of said supporting plate, a Tfs hape' guide formed on" the upper end of said pivot pin and adapted to be disposed in said T-shape guideway in said swinging block, a screw extending longitudinally of said T-shape guideway, said screw threaded through said T-shape guide and rotatably mounted in the end of said swinging block, means for rotating said screw, said rotation imparting radial movement to said swinging block with respect to said pivot-pin, a toolpost mounted vertically at the cuter end of said swinging blo'l said post hav ing a vertical slot therein, a sleeve about the out-' side of said post, a screw threaded in the top per-' mitting the insertion and clamping of a cutting factured and used by or for the Government oftool in said vertical slot against said sleeve, 2;

gear located-at the lower end of said pivot pin said swingingblock to be rotated about said pivot A P piif: f

file of this patent: V

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